#ifndef _USART_H
#define _USART_H

#include "gd32f4xx.h"

extern uint8_t RX_BUF[];
extern uint16_t RX_FLAG;


void USART_Init(void);
void send_byte(uint8_t data);
void send_array(uint8_t *arr,uint8_t len);
void send_string(uint8_t *string);



#endif 
